The Bug
When attempting to un-tie a lead after attempting to ride a horse away the lead knot will will stay on the fence post and unable to be untied.

Replicate (I don't really know how to replicate so I will just describe some of the steps I did)

• Tie a tamed to a lead and fence that is two blocks above the ground
• While the lead is still tied attempt to ride with horse till it strains the lead (Might have to do this multiple times)
• If done successfully you will be unable to remove the lead